Music is form of art in which different sounds are produced and organised in time. So in short we can say that music is combinations of different sounds. Each sound combination produce different music.
Music is mostly played alone or by voice which convert it to song.Common music instruments are guitar, violin, drums and piano etc.
No a days music can also produced by different apps on devices or pc. In which all instruments voices are saved. And any one can play it as a musical instrument.